I know there's always some risk shipping a fully built PC, but I sell PCs and some people from other cities wanted to buy them fully built. So, I want to ship them fully built, as safe as possible without spending a fortune on packaging. I filled the space between the parts with air packing bags and placed a 14"×16" (35×40cm) Instapak on top. I put the PC in its original case box and then put it in another larger box, filling the gaps with the parts boxes and extra cardboard, and wrapped fragile tape all around the box. This should be good enough, right? Any suggestions other than removing the GPU or cooler or other parts?